Feeding mechanism for sewing machines



March 20, 1928.

' J. BERGER FEEDING MECHANISM FOR snwme MACHINES Original Filed July 30. 1924 2 Sheets-Sheet 1 March 20, 1928. 1,663,490

J. BERGER FEEDING MECHANISM FOR SEWING MACHINES Patented Mar. 20, 1928.

; UNITED STATES: PATENT OFFICE.

JOSEPH BERGER, OF U'IICAl, NEW YORK, ASSIGNOB TO UNION SPECIAL MACHINE COM- IPAL'NY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

FEEDING MEcnANIsM non SEWING MACHINES.

Original application filed July 30,1924, Serial No. 729,099. Divided and 1924. Serial No. 729,101.

The invention relates to new and useful improvements in feeding mechanisms for sewing machines, and more particularly a feeding mechanism for an overedgestitching mechanism.

An object of the invention-is to provide a feeding mechanism having a main feed dog operating upon the material in rear of the needle, and an auxiliary feed dog operating upon the material in front of the needle with simplified and compact operatin devices for giving to said feed dogs a differential movement, when desired.

A still further object of the invention is to provide a feedingvmechanism of the above type which may be used for feeding and overedging small tubular articles.

a A still further object of the invention is to provide a common-means for raising and lowering said feed dogs which is capable of adjustment for taking up wear in the parts.

These and other objects will in part be ob vious and will in part be hereinafter more fully described.

In the drawings which show by way of illustration one embodiment of the l11VBl'l-' connectedto an arm tion- Y Figure 1 is a View partly in planand partly in section, showing a machine'having my improved feeding mechanism applied theret g Fig. 2 is an end view of a portion of a machine having my improvedfeeding mech anism embodied therein Fig. 3 is a sectional view of the machine on the line 33 of Fig. 1;

Fig. 4 is a detail in plan showing the clothplate and certain partsassociated th i h;

Fig. 5 is a detail, partly in section, showing the means for raising and lowering the feed bars; r

Fig 6 is'a detail in section, showing the manner of supporting and adjusting the cone shaped eccentric for taking up the wear.

The machine to whichjmy invention has been applied includes a bed plate 1, which carries suitable bearing brackets, in which a main shaft 2 rotates. One of these bearings is indicated at 3 in the drawings. At

the front of the bed plate there is an upthis application filed July 30,

standing bracket'4. The cloth plate of the machine is indicated at 5, and this cloth plate is secured to the upstanding bracket 4 and to a laterally projectingledge 6 on the bearing 8.- The cloth plate isshown in plan in Fig. 4. It is secured to the ledge 6 by means of screws 77 and is secured to the post or bracket 4 by a screw 8. This cloth plate is provided with a needle opening 9 along side of which is a stitch finger 10. In

front of the needle opening there is a cut away portion 11 in whicha lower stationar trimming blade 12 is set. Cooperating witfi this lower stationary trimming blade is an upper movable trimming blade 13. Said 1 blade 13 is carried by an arm 14, which is at tached to a short shaft 15, mounted in spaced bearings 1616, see Fig. 1. The shaft 15 has a collar" 17 rigidly secured thereto, which collar carries an upwardly'extending arm 18, and this arm 18 is oscillated by means of a link 19, which is connected to an arm 20 on the shaft 21, and the shaft 21 is oscillated by means of an eccentric strap 22', co-operating with an eccentric on the main shaft, and,

23 which is fixed to this shaft 21.

Located in rear of the needle slot is a main feed doghaving serrated fabric engaging sections 24'. Located in front-of the needle slot in an auxiliary feed dog having feeding sections25.. The feeding sections 24 of the. mainfeed dog are mounted on a bracket 26,

and this bracket 26 isintur n secured to a main feedbar 27. The auxiliary feeding sections'a're mounted on the forward end'of bracket 28, which in turn'is secured to an auxiliaryfeed bar 29. The feeding sections 24 "will "be hereinafter referred to as the main feed dog and the feeding sections 25 will be dog,

The main feed bar extends toward the rear loosely mounted on a fulcrum pin 33. This i hereinafter referred to as theauxiliary feed serves as a means for supporting the rear end of the main feed bar and the rock arms 32 are of suflicient length and so situated that the rear end of the feed bar moves in substantially a horizontal plane and this maintains the feeding sect-ions practically level during their feeding stroke. Rigidly secured to this fulcrum pin 33 is a bracket 34 which is provided with two upwardly ex-- receive a cone shaped operating member 42.

This cone shaped operating member 42 is carried by a stem 42 which is eccentrically mounted in the end of the main shaft 2 and secured therein by a set screw 42". The coneshaped operating member is capable of endwlse adjustment in the shaft and by reason of the fact that it is cone shaped, it can be shifted so as to take up any wear between the bearing sections 41 and the bracket 37 which raises and lowers the main feed bar. The Washer 42 fits loosely on the stem 42 and prevents the bearing sections 41 from sliding off the member 42.

The main feed bar is moved back and forth by means of a link 43, which link is connected to a bolt 44, mounted in the slot 36 of one of the arms 35. Said bolt is adjustably mounted in the slot and is capable of being set in its different adjusted positions. As the bracket 34 oscillates it will oscillate the arm and this arm through the link 43 will move the main feed bar back and forth. Said link is connected to the main feed bar by a pivot stud 45.

The bracket 26 carrying the main feed dog and forming a part thereof, is secured to the main feed bar by means of a screw 46. The supporting shank of the bracket 26 has a depending portion lying between spaced lugs on the main feed bar. A. screw 46 passes through a slot and this permits the main feed dog bracket to be raised and lowered. Said main feed bar has a horizontal extending web 47. The auxiliary feed bar rests on tlllS horizontal web and is secured to the main feed bar by two screws 4848 which pass through elongated slots in the auxiliary bar, and are threaded into the main bar. There is a front plate 49 in front of the auxiliary bar, through which said screws pass, and said front plate has an angularly extending portion 49 which overlies a laterally extending flange 50 on the auxiliary feed bar. This horizontal flange 50 rests on the horizontal web 47 of the main feed bar and is free to slide back and forth thereon. This is for the purpose of causing said auxiliary feed bar to be moved up and down with the main feed bar and at the same time permitting said auxiliary feed bar to have a difi erent or more extended movement than the main feed bar. Said auxiliary feed bar is moved back and forth by means of a link 51 which is pivoted at 52 to a depending lug 53 formed as a part of the auxiliary feed bar and projecting downwardly through a cut away portion in the web 47, see Fig. 2. Said link 51 is also pivotally connected to a bolt 54 adjustably mounted in a slot 36 in one of the arms 35.

I From the above, it will be noted that I have provided a feeding mechanism which includes a main and an auxiliary feed dog, which feed dogs are simultaneously raised and lowered by reason of the fact that one of said feed dogs is connected directly to the main feed bar and the other is carried by the main feed bar in such a way that it moves up and down with the main feed bar, although it is likewise capable of an endwise movement on the main feed bar. The extent of movement imparted to these feed dogs may, however, be different because said feed bars are separately connected to the bracket 34 atthe rear of the machine. This bracket, as has already been stated, is rigidly connected to a fulcrum pin 33. Said fulcrum pin 33 is likewise rigidly connected to an arm 55. mounted on the end thereof. There is an eccentric 56 on the main shaft 2, which is provided with an eccentric strap 57, and said eccentric strap 57 has a forked end 58 which embraces the end of the arm 55, and is pivotally connected thereto. When the main shaft 2 rotates through this eccentric 56 and eccentric strap 57, the bracket 34 will be oscillated and this bracket, through the links 43 and 51, will impart back and forth movements to the feed dogs.

It is noted that the forward end of the main feed bar has a laterally deflected p0rtion 59, to which the shank of the bracket 26 of the main feed dog is connected. As a result the main feed dog is set to one side of the plane of the main feed bar. The auxiliary feed bar is likewise provided with a similar offset portion 60, to which the auxiliary feed dog supporting bracket 28 is connected by means of a screw 61 which passes through a slot 62 in the shank of said bracket. The shank of the bracket is also located between parallel lugs on the auxiliary feed bar which makes a very rigid support for said auxiliary feed dog, but permits said auxiliary feed dog to be adjusted-vertically.

The cloth supporting plate 5 terminates a very short distance in rear of the main feed dog and also a very short distance in front of the auxiliary feed dog, and as a'result, small tubular articles can be stitched. The

fabric, as it leaves the cloth platein rear of the feed dog, may be directed downwardly and thence forwardly and up on to the front end of the cloth plate. The lateral offset features of the feed dog supporting shanks enables this to be accomplished without the fabric coming intoco-ntact with the operating parts of the feeding mechanism or the stitching mechanism beneath the cloth plate, and, of course, these parts are properly house-d by cover plates, as more fully shown and described in my co-pending application, Serial Number 729,099, filed of even date herewith of which the present applica tion is a division.

It will be noted that the operating mechanism for the feed dogs is all positive in its action and comprises comparatively few parts which are short and very directly connected to the operating shaft, so that there is little or no vibration of the feeding mechanism when the machine is running'at high speed. Inasmuch as the auxiliary feed dog is located wholly in advance of the needle, while the main feed dog is located wholly in rear of the needle, as indicated by the needle slots in Fig.4: of the drawings, it will readilybe understood that the auxiliary feed dog may be moved at a different speed from that of the main feed dog,,so that lmitfabrics, such as stockings or the like, may be easily hemmed on this machine.

It is obvious that minor changes in the details of construction and the arrangement of parts may be made without departing from the spirit of the invention as set forth in the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A feeding mechanism for sewing machines including in combination, a main feed bar, swinging rock arms for supporting the rear end of said main feed bar, means for raising and lowering said main feed bar, an auxiliary feed bar mounted on said main feed bar and movable up and down therewith, feed dogs carried by the respective feed bars, an oscillating shaft atthe rear of the machine supporting said swinging rock arms, a bracket rigidly secured to said shaft and having two separated upwardly extending arms, each of which is provided with a slot, a link having adjustable connection with one of said arms and a direct connection with the main feed bar for moving the same back and forth, and a link connected to the other arm and having a direct connection with the auxiliary feed bar for moving said auxiliary feed bar back and forth.

2. A feeding mechanism' for sewing machines including in combination, a main feed bar, a main feed dog carried thereby, rock arms for supporting the rear end of said movable u feed bar,means for raising and loweringthe' front end of the feed bar, an auxiliaryfeed bar mounted on said main feed bar and and down therewith, an oscillating shaft at the rear of themachine, a bracket rigidly secured to said shaft, and having independent upwardly extending arms, each of which is provided with a slot, a link having an adjustable connection with one of said arms and a direct connection with the main feed bar for moving it back and forth, a link having adjustable connection with the other arm and a direct connection with the'auxiliary feed bar for moving said auxiliary feed bar back and forth.

3. A feeding mechanism, for sewing machinesincluding in combination a main feed bar, a swinging device for supporting the rear end of said main feed bar, means for raising and lowering said main feed bar, an auxiliary feed bar mounted on said main feed bar and movable up and down therewith, feed dogs carried by the respective feed bars, an oscillating shaft at the rear of the machine on which said swinging device is freely mounted, a bracket rigidly secured to said shaft and having two separate upwardly extending arms, each of which is provided with a slot, a link having an adjustable connection with one of said arms and a connection with the main feed bar for moving the same back and forth, a link having an adjustable connection with the other arm and connected to said auxiliary feed bar'for moving the same back and forth, and means for oscillatingsaid shaft.

4. A feeding mechanism for sewing machines including a main feed bar, a main feed dog carried thereby, means for moving said main feed bar back and forth, and means for raising and lowering said main feed bar including a cone-shaped eccentric, and devices co-operating therewith, means for adjusting laterally the respective positions of said cone-shaped eccentric and said cooperating devices, whereby any wear between said eccentric and the co-operating devices may be taken up. 9

5. A feeding mechanism for sewing machines including in combination, a main feed bar, a main feed dog carried thereby, means for moving the main feed bar back and forth, a yoke attached to the main feed bar and depending therefrom, a main shaft, an eccentrically located cone shaped member carried by said main shaft, bearing pieces above andbelow said cone shaped eccentric for imparting the up and down movements to said yoke, said eccentric being adjustably mounted, whereby it may be shifted endwise to take up wear. 7 Y r 6. A feeding mechanism comprising a mainfeed bar, a main fee-d dog carried thereby, an auxiliary feed bar, an auxiliary feed dog carried by said auxiliary feed bar,

means for independently moving said main one above and the other below the same for feed bar and said auxiliary feed bar, means engaging the yoke for raising and lowering for raising and lowering said feed bars inthe feed bar, and means for shifting said 10 eluding a yoke attached to the main feed bar eccentric endwise for taking up wear.

5 and depending therefrom, a cone shaped ec- In testimony whereof, I affix my signature.

centric, means for rotating said eccentric,

bearing blocks associated with said eccentric, 1 JOSEPH BERGER. 

